The override module replaces the "toolMaterials" field in TConsructRegistry, but not doesn't touch toolMaterialStrings. This means if you try to look up a tool material by string instead of by ID number, it returns the old material, prior to the modifications made by the override module.

If this is intentional, it should probably be more clearly documented. I was using the TConstructRegistry.getMaterial(string) method in a Mantle manual to display material information, and it was returning pre-replacement materials, which confused me to no end.

You are correct, good sir.